Ignore some native tests on EC2

This is caused by something wrong with Ubuntu 20.04.
Ignore on EC2 agents for investigation.

subprojects/language-native/src/integTest/groovy/org/gradle/language/swift/SwiftIncrementalBuildIntegrationTest.groovy

@@ -17,8 +17,8 @@
 package org.gradle.language.swift
 
 import org.gradle.integtests.fixtures.CompilationOutputsFixture
-import org.gradle.integtests.fixtures.ToBeFixedForConfigurationCache
 import org.gradle.integtests.fixtures.SourceFile
+import org.gradle.integtests.fixtures.ToBeFixedForConfigurationCache
 import org.gradle.nativeplatform.fixtures.AbstractInstalledToolChainIntegrationSpec
 import org.gradle.nativeplatform.fixtures.RequiresInstalledToolChain
 import org.gradle.nativeplatform.fixtures.ToolChainRequirement
@@ -34,8 +34,12 @@ import org.gradle.nativeplatform.fixtures.app.SwiftApp
 import org.gradle.nativeplatform.fixtures.app.SwiftLib
 import org.gradle.test.fixtures.file.TestFile
 import org.gradle.util.VersionNumber
+import org.gradle.util.Requires
+import org.gradle.util.TestPrecondition
 
 @RequiresInstalledToolChain(ToolChainRequirement.SWIFTC)
+// https://github.com/gradle/gradle-private/issues/3387
+@Requires(TestPrecondition.NOT_EC2_AGENT)
 class SwiftIncrementalBuildIntegrationTest extends AbstractInstalledToolChainIntegrationSpec {
     @ToBeFixedForConfigurationCache
     def "rebuilds application when a single source file changes"() {